5 hp Tecumseh dry plug, primer seems to work, runs fine once started - Snowblower Forum : Snow Blower Forums
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post #1 of 19 Old 02-20-2018, 04:15 PM Thread Starter
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5 hp Tecumseh dry plug, primer seems to work, runs fine once started

I just came into a 5 hp Tecumseh blower. I went through the carbs and did some general maintenance and got her started up. When I went to start it up this morning I couldn't get it to fire up. Pulled the plug and it was dry. After priming, pulling, priming, pulling, etc the carb was overflowing with gas, but still a dry plug. I ended up pulling the plug and throwing some gas directly into the cylinder and it fired right up and ran like a top. I turned it off and tried pull starting it and it fired right up.

Any ideas? Seems strange to me.

Thanks in advance!
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post #2 of 19 Old 02-20-2018, 07:21 PM
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Unit is tilted so gas in carb can't run into the combustion chamber? Does one wheel have less air than the other? A spider built a cocoon at the bottom of the carb, essentially making a dam that the fuel can't flow over? Dunno. Just swingin' wild here. LOL
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post #3 of 19 Old 02-20-2018, 07:27 PM
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is the bowl gasket in good shape ?

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post #4 of 19 Old 02-20-2018, 07:58 PM
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.

I had an old 440 jet ski that acted like this.

The carbs were fine

It had low compression due to stuck rings.

Low compression also results in low suction (to pull in fuel)

Check compression

And also for air leaks in between carb and cylnder head
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post #5 of 19 Old 02-20-2018, 07:59 PM
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Quote:
Originally Posted by kippstakes View Post
I just came into a 5 hp Tecumseh blower. I went through the carbs and did some general maintenance and got her started up. When I went to start it up this morning I couldn't get it to fire up. Pulled the plug and it was dry. After priming, pulling, priming, pulling, etc the carb was overflowing with gas, but still a dry plug. I ended up pulling the plug and throwing some gas directly into the cylinder and it fired right up and ran like a top. I turned it off and tried pull starting it and it fired right up.

Any ideas? Seems strange to me.

Thanks in advance!
How did the choke work ... you only mentioned priming.
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post #6 of 19 Old 02-20-2018, 08:20 PM
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5641456 work.

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post #7 of 19 Old 02-20-2018, 08:42 PM
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A spray can of starting fluid is a handy thing to have around.....
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post #8 of 19 Old 02-20-2018, 10:04 PM
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I'm thinking air leak too. Carb to intake elbow or elbow to block. Had the same problem with a 10hp snapper. Found it was just loose bolts keeping it from starting.

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post #9 of 19 Old 02-22-2018, 01:40 AM Thread Starter
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Copression feels solid, it's not boggy when pulled and has good resistance. There doesn't appear to be any blow-by around the head gasket either. Also when it runs it runs strong and has no trouble tackling heavy snow/loads. It's at my gf's place, who I fixed it for (so I would have to shovel her nightmare driveway anymore), so I can't do a compression check at the moment. Next time I go over. It's not an old blower, from what she said the thing probably has under 25 hours on it. I will also check the elbow to block bolts when I get a chance.

The choke is functional but seems to have no effect on delivering fuel to the cylinder.

The carb and intake were clean when removed, so I doubt it's an obstruction. Considering that it runs well and restarts once ran I would rule that out.

Maybe it was just a fluke and it will start right up next time, we'll see next snow storm.

Thanks, guys.
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post #10 of 19 Old 02-22-2018, 02:45 AM
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Quote:
Originally Posted by kippstakes View Post

The choke is functional but seems to have no effect on delivering fuel to the cylinder.
what do u mean. if moving the choke from on to off and vice a versa does not change engine sound or rpms then thats wrong.
choke only controls the amount of air entering carb. on means less air(air is choked=less), off means more air for normal operating condition when warmed up from a cold start.

Bought a dead but now fixed 1980ish craftsman II 10/28....ITS ONE HEAVY BEAST

MY VIDS ON FIXIN HER UP

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Last edited by vinnycom; 02-22-2018 at 02:48 AM.
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